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1da177e4 LT |
1 | /* |
2 | * Copyright (C) 2000 - 2003 Jeff Dike (jdike@addtoit.com) | |
3 | * Licensed under the GPL | |
4 | */ | |
5 | ||
6 | #include "linux/sched.h" | |
7 | #include "linux/file.h" | |
8 | #include "linux/smp_lock.h" | |
9 | #include "linux/mm.h" | |
10 | #include "linux/utsname.h" | |
11 | #include "linux/msg.h" | |
12 | #include "linux/shm.h" | |
13 | #include "linux/sys.h" | |
14 | #include "linux/syscalls.h" | |
15 | #include "linux/unistd.h" | |
16 | #include "linux/slab.h" | |
17 | #include "linux/utime.h" | |
18 | #include "asm/mman.h" | |
19 | #include "asm/uaccess.h" | |
20 | #include "asm/ipc.h" | |
21 | #include "kern_util.h" | |
22 | #include "user_util.h" | |
23 | #include "sysdep/syscalls.h" | |
24 | #include "mode_kern.h" | |
25 | #include "choose-mode.h" | |
26 | ||
27 | /* Unlocked, I don't care if this is a bit off */ | |
28 | int nsyscalls = 0; | |
29 | ||
30 | long sys_fork(void) | |
31 | { | |
32 | long ret; | |
33 | ||
34 | current->thread.forking = 1; | |
35 | ret = do_fork(SIGCHLD, 0, NULL, 0, NULL, NULL); | |
36 | current->thread.forking = 0; | |
37 | return(ret); | |
38 | } | |
39 | ||
40 | long sys_vfork(void) | |
41 | { | |
42 | long ret; | |
43 | ||
44 | current->thread.forking = 1; | |
45 | ret = do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, 0, NULL, 0, NULL, | |
46 | NULL); | |
47 | current->thread.forking = 0; | |
48 | return(ret); | |
49 | } | |
50 | ||
51 | /* common code for old and new mmaps */ | |
52 | long sys_mmap2(unsigned long addr, unsigned long len, | |
53 | unsigned long prot, unsigned long flags, | |
54 | unsigned long fd, unsigned long pgoff) | |
55 | { | |
56 | long error = -EBADF; | |
57 | struct file * file = NULL; | |
58 | ||
59 | flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE); | |
60 | if (!(flags & MAP_ANONYMOUS)) { | |
61 | file = fget(fd); | |
62 | if (!file) | |
63 | goto out; | |
64 | } | |
65 | ||
66 | down_write(¤t->mm->mmap_sem); | |
67 | error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff); | |
68 | up_write(¤t->mm->mmap_sem); | |
69 | ||
70 | if (file) | |
71 | fput(file); | |
72 | out: | |
73 | return error; | |
74 | } | |
75 | ||
76 | long old_mmap(unsigned long addr, unsigned long len, | |
77 | unsigned long prot, unsigned long flags, | |
78 | unsigned long fd, unsigned long offset) | |
79 | { | |
80 | long err = -EINVAL; | |
81 | if (offset & ~PAGE_MASK) | |
82 | goto out; | |
83 | ||
84 | err = sys_mmap2(addr, len, prot, flags, fd, offset >> PAGE_SHIFT); | |
85 | out: | |
86 | return err; | |
87 | } | |
88 | /* | |
89 | * sys_pipe() is the normal C calling standard for creating | |
90 | * a pipe. It's not the way unix traditionally does this, though. | |
91 | */ | |
92 | long sys_pipe(unsigned long __user * fildes) | |
93 | { | |
94 | int fd[2]; | |
95 | long error; | |
96 | ||
97 | error = do_pipe(fd); | |
98 | if (!error) { | |
99 | if (copy_to_user(fildes, fd, sizeof(fd))) | |
100 | error = -EFAULT; | |
101 | } | |
102 | return error; | |
103 | } | |
104 | ||
105 | ||
106 | long sys_uname(struct old_utsname * name) | |
107 | { | |
108 | long err; | |
109 | if (!name) | |
110 | return -EFAULT; | |
111 | down_read(&uts_sem); | |
112 | err=copy_to_user(name, &system_utsname, sizeof (*name)); | |
113 | up_read(&uts_sem); | |
114 | return err?-EFAULT:0; | |
115 | } | |
116 | ||
117 | long sys_olduname(struct oldold_utsname * name) | |
118 | { | |
119 | long error; | |
120 | ||
121 | if (!name) | |
122 | return -EFAULT; | |
123 | if (!access_ok(VERIFY_WRITE,name,sizeof(struct oldold_utsname))) | |
124 | return -EFAULT; | |
125 | ||
126 | down_read(&uts_sem); | |
127 | ||
128 | error = __copy_to_user(&name->sysname,&system_utsname.sysname, | |
129 | __OLD_UTS_LEN); | |
130 | error |= __put_user(0,name->sysname+__OLD_UTS_LEN); | |
131 | error |= __copy_to_user(&name->nodename,&system_utsname.nodename, | |
132 | __OLD_UTS_LEN); | |
133 | error |= __put_user(0,name->nodename+__OLD_UTS_LEN); | |
134 | error |= __copy_to_user(&name->release,&system_utsname.release, | |
135 | __OLD_UTS_LEN); | |
136 | error |= __put_user(0,name->release+__OLD_UTS_LEN); | |
137 | error |= __copy_to_user(&name->version,&system_utsname.version, | |
138 | __OLD_UTS_LEN); | |
139 | error |= __put_user(0,name->version+__OLD_UTS_LEN); | |
140 | error |= __copy_to_user(&name->machine,&system_utsname.machine, | |
141 | __OLD_UTS_LEN); | |
142 | error |= __put_user(0,name->machine+__OLD_UTS_LEN); | |
143 | ||
144 | up_read(&uts_sem); | |
145 | ||
146 | error = error ? -EFAULT : 0; | |
147 | ||
148 | return error; | |
149 | } | |
150 | ||
151 | DEFINE_SPINLOCK(syscall_lock); | |
152 | ||
153 | static int syscall_index = 0; | |
154 | ||
155 | int next_syscall_index(int limit) | |
156 | { | |
157 | int ret; | |
158 | ||
159 | spin_lock(&syscall_lock); | |
160 | ret = syscall_index; | |
161 | if(++syscall_index == limit) | |
162 | syscall_index = 0; | |
163 | spin_unlock(&syscall_lock); | |
164 | return(ret); | |
165 | } | |
166 | ||
167 | /* | |
168 | * Overrides for Emacs so that we follow Linus's tabbing style. | |
169 | * Emacs will notice this stuff at the end of the file and automatically | |
170 | * adjust the settings for this buffer only. This must remain at the end | |
171 | * of the file. | |
172 | * --------------------------------------------------------------------------- | |
173 | * Local variables: | |
174 | * c-file-style: "linux" | |
175 | * End: | |
176 | */ |